Oil filter



Af iril 14, 1931. H. T. WOOLSON OIL FTLTFIR Filed Feb. 8, 1928 INVENTOR //4/?/? Y T WUdLcSU/M ATTORNEY Patented Apr. 14, 1931 UNITED STATES PATENT OFFICE HARRY T. WOOLSON, OF DETROIT, MICHIGAN, ASSIGN OR TO CHRYSLER CORPORATION,

OF DETROIT, MICHIGAN, A CORPORATION OF DELAWARE OIL FILTER Application filed February 8, 1928. Serial No. 252,766.

This invention relates to an oil filter and more particularly to an oil filter for use in the oil sump of an internal combustion engine.

It is an important object of this invention to provide an oil filter, for the suction pipe of the oil pump, submerged in the oil supply in the crankcase of an internal combustion engins, whereby oil may be allowed to pass from the crank case, through the filter, into the suction line and oil pump and from there to the various parts of the engine to be lubricated.

Another object of the invention is to provide a means for creating an air chamber within the filter which maintains a predetermined oil level within the filter, and to provide a means for raising that oil level as the portion of the filter below theoil level becomes clogged by the sediment filtered from the oil or from other causes.

A further object of the invention is to provide a device of inexpensive and economical construction, which maybe readily assembled or disassembled to permit replacement or cleaning.

The above and other objects of my invention will more fully appear from the following description, taken in connection with the accompanying drawing, in which:

Fig. 1 is a sectional View thru a portion of the crankcase of an internal combustion engine showing my improved device in section, as well as a conventional oil pump in elevation, the suction pipe for the pump being partly in section.

Fig. 2 is a sectional view on 22 of Fig. 1, as viewed in a direction indicated by the arrows.

Referring to an illustrated embodiment of my invention, I have shown an engine crankcase 10, formed by uniting an oil pan 12 with the cylinder block 14. A conventional oil pump 16 is provided with a conduit 18, shown broken away, adapted to deliver oil from the oil pump to the various parts of the engine to be lubricated. A vertically disposed conduit 20 is adapted to have its lower end positioned adjacent the bottom of the crankcase and its upper end in communication with the oil pump, forming a suction pipe thru which oil is drawn from the crankcase to the oil pump, there to be forced thru the conduit 18.

The lower. end of the conduit 20 is closed by a plug 22 which is received against a shoulder 24 formed by counterboring the open end. A pin 26, passing thru openings in the wall of the conduit 20, secures the plug 22 in position, or the plug 22 may be pressed in the counterbore. Openings 28 are provided in the wall of the conduit 20 to permit the oil to enter the conduit 20 thru the side thereof rather than. thru the bottom.

Positioned on the conduit 20, above the openings 28, is adrum shaped casing 30 consisting of an upper plate 32, extending horizontally and an annular flange or skirt 34 extending vertically therefrom at the outer edge of the plate 32. The upper plate is joined tothe conduitas at 35, forming a liquid tight seal. The bottom of the casing 30 is open so that the oil in the crankcase may enter the casing thru the bottom. As the upper plate 32 is closed and the bottom is sealed by the oil, an air chamber is provided within the casing which normally maintains a predetermined oil level Within the casing that is lower than the level outside the casing as is shown in Fig. 1.

Slidably mounted on the lower end of the conduit 20, below the openings 28, is a bowl shaped spider consisting of a center plate 38 having diverging arms 40 extending outwardly and upwardly, being joined together at their ends by a ring 42. 'A screen 44, or other suitable filtering material, is provided. over the outer surface of the spider and is secured thereto by binders 46 folded over the upper edges of the ring 42 and screen 44, and over the periphery of theopening in the plate 38 and screen 44 thru which the lower end of the conduit 20 extends.

A coil spring 48, around the conduit 20, is positioned between the lower edge of the spider 36 and a washer 50, the latterbeing positioned on the lower fendof the conduit 20 by the pin 26. The pin 26 may be removed for the purpose of replacement or cleaning 3f the screen 44. The spring 48 also serves to urge the spider 36 against the upper plate 32 of the drum shaped casing 30 to prevent rattle. Y i

of the various parts. 7 Should the portion-oi, :the screen belowthe1oilleyelbeeomeclo'gged, 7 so that oil may. notgp'ass therethrm'jthe"sue tion of the 'jpump will draw air from the trapped air chamber, above the oil level in}, thecasing 30, and thereby permit raisingio'f the oil level tofpermitfthe oil toaflowthru'; another portioniof the-screen above the origi-' j V m1 oil level: By this construction, provision has beenmade forcont'inuously filtering the oil 'ja fter cert'ainfportionsi of the screen have I becomeiclog'gedp 'fp H ''llvhilel-havedescribed what I deemto -be thel p'referred embodiment of my invention, YitWill-bek obvious that various changes may be? made in the; arrangement, combination and construction of-the various parts t my im roved device'fwithout departing-from the spirit of my'invention, and it is notmy infang substant'ially 'fluidtighticup' shaped I casing arrange'd'iin an invertedposition; a

' 1 '60 'ingsinthe'sidethereof;acup-shapedframe Q mounted on said conduit 'on oneside of the I i nlet' openings thereof, a shieId mounted'on said 'coij duitontheopposite'sideof said'inlet L Openings comprising an end wall and'arcylin the crankcase will be drawn i by the suction of the pump 16 thru-that portion of the screen belowthe oil level within the casing- 30, openings2 8; and conduit-20 to bepassed on by the pump for the-suitable lubrication .tentionf to'llimit its" scope other than the terms'fof the appended claims. What-Iclaim'is;

i -1-.: A device of the 'classdescribed compris a conduit having a 'side' opening and closed atits'lower end, 'a c'upfl shaped filtering meansdetachablycsecured onlsaid conduit between-the? side opening "and-the closed lower 1 end.ofsaidfc onduit'y-a"substantially fiuid tiglit I W shaped casing; seen-radio, ,said conduit above'th'e side opening projecting outwardly V in sealing contact-withftlie upper edge of theon the exterior of said'frame having edge portions surrounding the outer edges of said frameand engaged between the latter and the crimped' part'of said.shie1d. 1

5. The'combination with-a crankcaselubricant reservoir, ofa suction pump an inlet and a closed'oute'r extremityy a shield. mount ed on saidconduit having an impervious upper'wall above saidapertures including a de conduit f in communieation vvith said pump "having. inlet "apertures iirith'e" sides thereof pending :imperviousg skirt," and: a filtering member'havingforaminousside walls and a foramlnous lower wall b'elow sald: apertures and lying substantiallyiwithin saidfskirt, said filtering memberiand' shield beinglsubmer'gedj in the oil of said reservoir-and forming fan air pocket th'e'rein forstemporarily. preventrf ing utilization of /the upperiportion of the ber "untilj zthe lower wall portions ibecoine clogg d.-

foraminous sidewalls of: said' filtering mem inlet. conduit in communication with J said r pump having-inlet apertures in.;the-. sides.

thereof and a closedaouter extremity a shield submerged-in said reservoir includingan up;

per impervious w all and"= a; deep depending skirt "part, and a foraminous *bo'dy withinwhich said inlet apertures are lOQatd5 said body being providedvvith'zdeep filteringwalls and forming with theskirtpart aideep e1on-- gateddoiwnwardly'openairpocketu a r -::HARBY;' I IWQOLSON; 1'

cup-"shaped filtering means and projecting do n a d fero ai l r n a point below the"side opening'in-said conduit.

2., A device of the class described compris cup shaped filtering memberlwithin said fcas having its open end'extending upwardly I in liquid sealing engagement-with saidbas- 1 Z v ing fandaconduit-throughsaidrcasinghaw -l 1" ing,anfinlet 'openingfwithinthei cup shaped filtering me ber; and" above the, lower edge I of said casing.

3;ln' a ifilteigfa conduiflhavingan Einlet op ing;acp ashap usf ame repented onsaid I V "'conduit'belowjsaidinletopening, a jshield dn' jsaidconduit abOYQ.said'openihgVS11b$taritiaL j 1 rr n n l said; rame,'-and a screen on said framengaged over the outeredgethere F v ofljsaidj "screen; being clamped between'said 'shield and the outer edgejoi said frame} 

